Good question, will get Ford and Chevy answers.
It depends on several bits of criteria, I still use Pi sys1 equipment. Mainly because I have it and it works, period.
The truth of the matter is this, in todays technology, data recorders are a dime a dozen.
There are many more available now than say 3 years ago.
My criteria is as follows;
relaibility, can you trust the data?
drivers data, can the driver make a decision from the display?
software, again, can you make sense of the data or are they just pretty lines.
export of data, can the data be used in excel directly?
If I had to reinvest into data, I would go CDS, competition data systems.
PM me if you wish, or e-mail
John